In-vehicle device

Abstract

The application discloses a vehicle-mounted device. The vehicle-mounted device comprises a collection device configured to collect target data, a host device configured to process the target data, and a same-axis cable configured to be connected between the collection device and the host device and configured to transmit the target data. The same-axis cable is determined based on a preset test rule and is obtained by m same-axis cables through m-1 times of switching, so that the vehicle-mounted device meets the vehicle-mounted electrostatic test requirement. The application improves the high-speed signal performance of the whole vehicle and reduces the wiring cost of the actual vehicle.

Description

Technical Field

[0001] The disclosed embodiments of this application relate to the automotive field, and more specifically, to an in-vehicle device. Background Technology

[0002] In vehicle design, factors such as the length of different wires and cables, the number of transitions, and connectors all affect signal transmission quality. However, when wiring in actual vehicles, untested designs are often directly wired and inspected. If the inspection results are unsatisfactory, the cost of modification and adjustment will be extremely high. Summary of the Invention

[0003] According to embodiments of this application, this application proposes an in-vehicle device to improve the high-speed signal performance of the entire vehicle and reduce the actual vehicle wiring cost.

[0004] The first aspect of this application discloses an in-vehicle device, comprising: a data acquisition device for acquiring target data; a host device for processing the target data; and a combined coaxial cable connected between the data acquisition device and the host device for transmitting the target data; wherein the combined coaxial cable is obtained by connecting m coaxial cables through m-1 turns based on preset test rules, thereby the in-vehicle device meets the requirements for in-vehicle electrostatic testing.

[0005] In some embodiments, the preset test rules include: obtaining at least one preset combination coaxial cable, each preset combination coaxial cable being obtained by n coaxial cables through n-1 conversions, wherein the sum of the cable lengths of the n coaxial cables through n-1 conversions is a preset value, and the lengths of the n coaxial cables are the same, partially the same, or different, and n≥1; performing electrostatic discharge testing using the at least one preset combination coaxial cable to obtain at least one test result; and selecting the combination coaxial cable from the at least one preset combination coaxial cable based on the at least one test result.

[0006] In some embodiments, the preset value includes a first preset value and a second preset value, wherein the second preset value is less than the first preset value; the at least one preset combined coaxial cable includes at least: a first combined coaxial cable in which the sum of the lengths of n coaxial cables after n-1 conversions is the first preset value; a second combined coaxial cable in which the sum of the lengths of n coaxial cables after n-1 conversions is the second preset value; and a third combined coaxial cable in which the sum of the lengths of n-1 coaxial cables after n-2 conversions is the first preset value.

[0007] In some embodiments, performing electrostatic discharge (ESD) testing using the at least one preset coaxial cable combination includes: performing the ESD test on the first coaxial cable combination; determining whether the ESD test result of the first coaxial cable combination meets the vehicle ESD test requirements; and, in response to the ESD test result of the first coaxial cable combination not meeting the vehicle ESD test requirements, determining whether the first preset value is the minimum value of the sum of the cable lengths of the n coaxial cables.

[0008] In some embodiments, the electrostatic discharge (ESD) test using the at least one preset combination of coaxial cables further includes: performing the ESD test on the second combination of coaxial cables in response to the first preset value not being the minimum of the sum of the cable lengths of the n coaxial cables; and performing the ESD test on the third combination of coaxial cables in response to the first preset value being the minimum of the sum of the cable lengths of the n coaxial cables.

[0009] In some embodiments, the electrostatic discharge (ESD) test using the at least one preset coaxial cable combination further includes: determining whether the fourth coaxial cable combination exists in response to the ESD test result of the first coaxial cable combination meeting the vehicle ESD test requirements; performing the ESD test on the fourth coaxial cable combination in response to the existence of the fourth coaxial cable combination; and determining whether the ESD test of the at least one preset coaxial cable combination is completed in response to the absence of the fourth coaxial cable combination; wherein the fourth coaxial cable combination consists of N coaxial cables that have undergone n-1 transfers and the sum of their lengths is the first preset value, the lengths of the N coaxial cables combination are different from those of the n coaxial cables combination, and N = n.

[0010] In some embodiments, the electrostatic discharge (ESD) test using the at least one preset coaxial cable combination further includes: in response to the incomplete ESD test of the at least one preset coaxial cable combination, performing the ESD test on the remaining preset coaxial cables in the at least one preset coaxial cable combination; and in response to the completion of the ESD test of the at least one preset coaxial cable combination, performing high-frequency parameter testing on the at least one preset coaxial cable combination to obtain corresponding radio frequency (RF) parameters.

[0011] In some embodiments, the radio frequency parameters include at least one of scattering parameters, voltage standing wave ratio (VSWR), and time domain reflectometer parameters.

[0012] In some embodiments, the n coaxial cables in the at least one preset combination coaxial cable are connected in a U-shape and / or an S-shape.

[0013] In some embodiments, the combined coaxial cable includes a serializer, a deserializer, and a transmission link for transmitting the target data.

[0014] The beneficial effects of this application are as follows: the vehicle-mounted equipment includes a data acquisition device, a host device, and a combined coaxial cable. The combined coaxial cable is used to connect the data acquisition device and the host device to achieve the transmission of target data. In particular, using a combined coaxial cable determined based on preset test rules for connection can improve the high-speed signal performance of the whole vehicle and reduce the actual vehicle wiring cost. Attached Figure Description

[0015] The present application will be further described below with reference to the accompanying drawings and embodiments. In the drawings:

[0016] Figure 1 This is a schematic diagram of the structure of the vehicle-mounted device according to an embodiment of this application;

[0017] Figure 2 This is a partial schematic diagram of a preset combined coaxial cable according to an embodiment of this application;

[0018] Figure 3 This is a schematic flowchart of an electrostatic test according to an embodiment of this application.

[0019] Figure 4 This is a schematic diagram of an electrostatic discharge-discharge island test bench according to an embodiment of this application;

[0020] Figure 5 This is a schematic diagram of a cable high-frequency parameter testing bench according to an embodiment of this application;

[0021] Figure 6 This is a schematic diagram of the combined coaxial cable in an embodiment of this application. Detailed Implementation

[0022] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0023] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " generally indicates that the preceding and following related objects are in an "or" relationship. Furthermore, "many" in this application means two or more. Moreover, the term "at least one" in this application means any combination of at least two of any one or more of a plurality of objects. For example, including at least one of A, B, and C can mean including any one or more elements selected from the set consisting of A, B, and C. Furthermore, the terms "first," "second," and "third" in this application are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features.

[0024] To enable those skilled in the art to better understand the technical solution of this application, the technical solution of this application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0025] Please see Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle-mounted device according to an embodiment of this application. The vehicle-mounted device 10 includes a data acquisition device 110, a host device 120, and a combined coaxial cable 130.

[0026] Acquisition device 110 is used to acquire target data. For example, acquisition device 110 is a SerDes (Serializer / Deserializer) camera device, and the target data can be audio and video data. Host device 120 can be a SerDes host device, used to receive and process the audio and video data acquired by acquisition device 110.

[0027] A combined coaxial cable 130 connects the acquisition device 110 and the host device 120 to transmit the audio and video data acquired by the acquisition device 110 to the host device 120 for processing. The combined coaxial cable 130 is formed by m coaxial cables through m-1 interchanges, based on preset test rules, to ensure that the vehicle-mounted device 10 meets the requirements of vehicle electrostatic discharge testing.

[0028] For example, the combined coaxial cable 130 can be a combination A of five coaxial SerDes cables that have undergone four conversions. Since this combination A is determined based on preset test rules, the acquisition device 110 and the host device 120 connected by combination A can pass the vehicle electrostatic test, that is, they can work normally in the environment of electrostatic discharge (ESD).

[0029] In this embodiment, the vehicle-mounted device 10 includes a data acquisition device 110, a host device 120, and a combined coaxial cable 130. The combined coaxial cable 130 is used to connect the data acquisition device 110 and the host device 120 to transmit target data. Using the combined coaxial cable 130 determined based on preset test rules for connection can improve the high-speed signal performance of the whole vehicle and reduce the actual vehicle wiring cost.

[0030] In some embodiments, the preset test rules include: obtaining at least one preset combined coaxial cable, each preset combined coaxial cable being obtained by n coaxial cables through n-1 conversions; performing electrostatic discharge testing using at least one preset combined coaxial cable to obtain at least one test result; and selecting a combined coaxial cable from at least one preset combined coaxial cable based on the at least one test result.

[0031] In this system, the sum of the lengths of the n coaxial cables after n-1 transitions is a preset value. The lengths of the n coaxial cables are the same, partially the same, or different, where n represents a variable. That is, at least one preset combination of coaxial cables is composed of multiple coaxial SerDes cables. The lengths of the coaxial cables are the same, partially the same, or different. The coaxial SerDes cable models can be the same or different, and the cable lengths include 1 meter, 2 meters, 3 meters, 4 meters, 5 meters, 10 meters, 15 meters, etc. For example, a pre-set combination of five coaxial cables with a total length of 10 meters after four adapters can be 5+2+1+1+1, 4+3+1+1+1, 4+2+2+1+1, 3+3+2+1+1, 3+2+2+2+1, 2+2+2+2+2, etc.; a pre-set combination of four coaxial cables with a total length of 10 meters after three adapters can be 5+2+2+1, 4+3+3+1, 4+4+1+1, 3+3+3+1, 3+3+2+2, 4+2+2+2, etc.

[0032] Obtain at least one preset coaxial cable combination, where each preset coaxial cable combination is obtained by n coaxial cables through n-1 connections, such as... Figure 2 As shown, Figure 2 This is a partial schematic diagram of a preset combined coaxial cable according to an embodiment of this application. Further, at least one preset combined coaxial cable is used to perform electrostatic discharge testing to obtain at least one test result. For example, at least one preset combined coaxial cable is used to connect the acquisition device 110 and the host device 120, and exposed to a 25kV electrostatic discharge environment to test whether the device connected to the preset combined coaxial cable can function normally. That is, through at least one test result, it is determined whether the corresponding preset combined coaxial cable can pass the vehicle electrostatic discharge test, and the preset combined coaxial cable that passes the electrostatic discharge test can be used as the selectable combined coaxial cable 130.

[0033] In some embodiments, the preset value includes a first preset value and a second preset value, wherein the second preset value is less than the first preset value; at least one preset combined coaxial cable includes at least: a first combined coaxial cable in which the sum of the lengths of n coaxial cables after n-1 conversions is the first preset value; a second combined coaxial cable in which the sum of the lengths of n coaxial cables after n-1 conversions is the second preset value; and a third combined coaxial cable in which the sum of the lengths of n-1 coaxial cables after n-2 conversions is the first preset value.

[0034] The sum of the lengths of the n coaxial cables after n-1 transitions includes a first preset value and a second preset value, where the second preset value is less than the first preset value, for example, the second preset value is 1 meter less than the first preset value. If n=5, then at least one preset combination of coaxial cables includes at least a first combination of coaxial cables, a second combination of coaxial cables, and a third combination of coaxial cables. The first combination of coaxial cables can be five coaxial cables that have undergone four transitions and have a sum of 10 meters in length. The second combination of coaxial cables can be five coaxial cables that have undergone four transitions and have a sum of 9 meters in length. The third combination of coaxial cables can be four coaxial cables that have undergone three transitions and have a sum of 10 meters in length.

[0035] In some embodiments, electrostatic discharge (ESD) testing is performed using at least one preset combination of coaxial cables, including: performing an ESD test on a first combination of coaxial cables; determining whether the ESD test result of the first combination of coaxial cables meets the requirements for vehicle-mounted ESD testing; and, in response to the ESD test result of the first combination of coaxial cables not meeting the requirements for vehicle-mounted ESD testing, determining whether a first preset value is the minimum of the sum of the cable lengths of the n coaxial cables.

[0036] For example, the first coaxial cable combination A1 has a length of 2+2+2+2+2, the second coaxial cable combination B1 has a length of 1+2+2+2+2, and the third coaxial cable combination C1 has a length of 3+3+2+2. Electrostatic discharge (ESD) testing is performed on the first coaxial cable combination A1, for example, using an ESD discharge island to perform a ±25kV test. The ESD test result of the first coaxial cable combination A1 is then determined to meet the requirements for vehicle-mounted ESD testing, i.e., whether the device connected to the first coaxial cable combination A1 can function normally in a ±25kV ESD discharge environment. If the ESD test result of the first coaxial cable combination A1 does not meet the requirements for vehicle-mounted ESD testing, then it is determined whether the cable length of the first coaxial cable combination A1 is the minimum sum of the lengths of the five coaxial cables. For example, the minimum sum of the lengths of the five coaxial cables could be 5 meters (1+1+1+1+1).

[0037] Furthermore, in some embodiments, an electrostatic test is performed on the second combination of coaxial cables in response to the first preset value not being the minimum of the sum of the cable lengths of the n coaxial cables.

[0038] For example, if the sum of the lengths of the first coaxial cable combination A1 (10 meters) is not the minimum sum of the lengths of the five coaxial cables (5 meters), then an electrostatic discharge (ESD) test is performed on the second coaxial cable combination B1. This involves testing a preset coaxial cable combination with the same number of connections but a sum of cable lengths reduced by one in a ±25kV ESD environment to determine if the device connected to the second coaxial cable combination B1 can function normally. Similarly, the ESD test result of the second coaxial cable combination B1 is then used to determine if it meets the requirements for vehicle-mounted ESD testing. If the ESD test result of the second coaxial cable combination B1 does not meet the requirements, then the sum of the lengths of the second coaxial cable combination B1 (9 meters) is determined to be the minimum sum of the lengths of the five coaxial cables (5 meters).

[0039] In some embodiments, an electrostatic test is performed on the third coaxial cable combination in response to a first preset value being the minimum sum of the cable lengths of the n coaxial cables.

[0040] For example, the first coaxial cable combination A2 is 1+1+1+1+1, the second coaxial cable combination B2 is 1+1+2+2+3, and the third coaxial cable combination C2 is 1+1+1+2. An electrostatic discharge (ESD) test is performed on the first coaxial cable combination A2 to determine if its ESD test result meets the vehicle-mounted ESD test requirements, i.e., whether the device connected to the first coaxial cable combination A2 can function normally in a ±25kV ESD discharge environment. If the ESD test result of the first coaxial cable combination A2 does not meet the vehicle-mounted ESD test requirements, it is determined whether the cable length of the first coaxial cable combination A2 is the minimum sum of the lengths of the five coaxial cables (5 meters). In response to the first coaxial cable combination A2 having a total length of 5 meters, an ESD test is performed on the third coaxial cable combination C2, i.e., a pre-defined coaxial cable combination with one fewer connection and the same total cable length. Similarly, to determine whether the electrostatic discharge test result of the third coaxial cable C2 meets the requirements of vehicle electrostatic discharge test, in response to the fact that the electrostatic discharge test result of the third coaxial cable C2 does not meet the requirements of vehicle electrostatic discharge test, and the cable length (5 meters) of the third coaxial cable C2 is not the minimum value (4 meters) of the sum of the cable lengths of the four coaxial cables, further, electrostatic discharge test can be performed on the four coaxial cables with 3 transfers and a sum of cable lengths of 4 meters.

[0041] Furthermore, in some embodiments, in response to the electrostatic discharge test result of the first combination of coaxial cables meeting the vehicle electrostatic discharge test requirements, it is determined whether a fourth combination of coaxial cables exists; in response to the existence of the fourth combination of coaxial cables, an electrostatic discharge test is performed on the fourth combination of coaxial cables; in response to the absence of the fourth combination of coaxial cables, it is determined whether an electrostatic discharge test of at least one preset combination of coaxial cables has been completed; wherein, the fourth combination of coaxial cables is N coaxial cables that have undergone n-1 transfers and the sum of the cable lengths is a first preset value, the lengths of the N coaxial cables are different from those of the n coaxial cables, and N = n.

[0042] Taking the first coaxial cable combination A1 as an example, A1 is 2+2+2+2+2. Responding to the fact that the electrostatic discharge test result of the first coaxial cable combination A1 meets the vehicle electrostatic discharge test requirements, it is determined whether a fourth coaxial cable combination exists. That is, in a ±25kV electrostatic discharge environment, the device connected to the first coaxial cable combination A1 can work normally, thus determining whether a fourth coaxial cable combination exists. The fourth coaxial cable combination is N coaxial cables that have undergone n-1 transfers, and the sum of their lengths is a first preset value. The lengths of the N coaxial cables are different from those of the n coaxial cables, and N = n. This means other combinations of lengths of five coaxial cables that have undergone 4 transfers and whose sum of lengths is 10 meters. For example, the fourth coaxial cable combination D1 could be 1+3+2+2+2, 1+1+3+3+2, etc. In this case, in response to the existence of the fourth coaxial cable combination D1, an electrostatic discharge test is performed on D1.

[0043] Alternatively, taking the first coaxial cable combination A2 as an example, A2 is 1+1+1+1+1. In response to the electrostatic discharge (ESD) test result of A2 meeting the vehicle ESD test requirements, it is determined whether a fourth coaxial cable combination exists. That is, in a ±25kV ESD environment, the device connected to A2 can operate normally, thus determining whether a fourth coaxial cable combination exists. The fourth coaxial cable combination consists of N coaxial cables that have undergone n-1 transfers, with the sum of their lengths equal to a first preset value. The lengths of these N coaxial cables differ from those of the original n coaxial cables, and N = n. Specifically, it consists of other length combinations of five coaxial cables that have undergone four transfers and whose sum of lengths is 5 meters. Accordingly, it is determined that a fourth coaxial cable combination does not exist. In this case, in response to the absence of a fourth coaxial cable combination, it is determined whether at least one preset coaxial cable combination has undergone ESD testing, such as whether the ESD tests for the second coaxial cable combination B2, the third coaxial cable combination C2, and other preset coaxial cable combinations have been completed.

[0044] In some embodiments, electrostatic discharge (ESD) testing using at least one preset coaxial cable combination further includes: in response to the failure to complete the ESD test of at least one preset coaxial cable combination, performing ESD testing on the remaining preset coaxial cables in the at least one preset coaxial cable combination; and in response to the completion of the ESD test of at least one preset coaxial cable combination, performing high-frequency parameter testing on the at least one preset coaxial cable combination to obtain corresponding radio frequency (RF) parameters.

[0045] In response to the absence of a fourth coaxial cable combination, determine whether electrostatic discharge (ESD) testing of at least one preset coaxial cable combination has been completed, i.e., whether ESD testing of all preset coaxial cables combination has been completed. If it is determined that there are still preset coaxial cables combination that have not been ESD tested, then continue to perform ESD testing on the untested preset coaxial cables according to the preset test trajectory.

[0046] Alternatively, if it is determined that electrostatic discharge (ESD) testing of at least one preset coaxial cable combination has been completed, then high-frequency parameter testing of the at least one preset coaxial cable combination is performed to obtain the corresponding radio frequency (RF) parameters. For example, high-frequency parameter testing of the preset coaxial cable combination that meets the requirements of automotive ESD testing is performed to quantify the RF parameter information of the preset coaxial cable combination that meets the requirements of automotive ESD testing.

[0047] In some embodiments, the radio frequency parameters include at least one of the following: scattering parameter (S-parameter), voltage standing wave ratio (VSWR), and time domain reflectometry (TDR parameter).

[0048] To facilitate understanding, the process of determining the combined coaxial cable based on preset test rules in this application embodiment is illustrated with an example. For example... Figure 3 As shown, Figure 3 This is a schematic diagram of the electrostatic test process according to an embodiment of this application.

[0049] S31: Obtain the first combination of cables. That is, obtain the first combination of coaxial cables whose total length is a first preset value after n-1 transfers. For example, it can be 5 coaxial cables that have undergone 4 transfers and whose total length is 10 meters.

[0050] S32: Determine whether the electrostatic test results meet the requirements for vehicle-mounted electrostatic testing.

[0051] One of the judgment results of step S32 is: in response to the fact that the electrostatic test result of the first combination cable does not meet the requirements of vehicle electrostatic test, step S33 is executed.

[0052] The second judgment result of step S32: In response to the fact that the electrostatic test result of the first combination cable meets the requirements of vehicle electrostatic test, step S36 is executed.

[0053] S33: Determine if the sum of the cable lengths is the minimum value of the current combination of coaxial cables. In response to the electrostatic discharge test result of the first combination of cables not meeting the vehicle electrostatic discharge test requirements, record the corresponding baseline voltage threshold, and determine if the sum of the cable lengths of the first combination of cables is the minimum value of the combination of coaxial cables corresponding to the current number of transfers. For example, the minimum sum of the cable lengths of the 5 coaxial cables after 4 transfers is 5 meters.

[0054] One of the judgment results of step S33 is: in response to the fact that the sum of the cable lengths of the first combination of cables is not the minimum value of the current combination of coaxial cables, step S34 is executed.

[0055] The second result of step S33: In response to the sum of the cable lengths of the first combination of cables being the minimum value of the current combination of coaxial cables, step S35 is executed.

[0056] S34: Obtain the second combination cable. Obtain the second combination cable for electrostatic discharge (ESD) testing. This involves obtaining a second combination of coaxial cables whose sum of lengths after n-1 transfers is a second preset value. For example, it could be five coaxial cables that have undergone four transfers and whose sum of lengths is 9 meters. Understandably, if the sum of the lengths of the first combination cable is not the minimum value for the combination of coaxial cables corresponding to the current number of transfers, then an ESD test is performed on the combination of coaxial cables with the same number of transfers but a length reduced by 1 meter.

[0057] S35: Obtain the third combination cable. Obtain the third combination cable for electrostatic discharge (ESD) testing. This involves obtaining a third combination of coaxial cables whose sum of lengths (n-1) after n-2 transfers equals a first preset value. For example, this could be four coaxial cables that have undergone three transfers and whose sum of lengths is 10 meters. Understandably, in response to the first combination cable's sum of lengths being the minimum value among the combined coaxial cables corresponding to the current number of transfers, an ESD test is performed on the combined coaxial cable with one less transfer and the same cable length.

[0058] S36: Determine if a fourth combination cable exists. The fourth combination coaxial cable consists of N coaxial cables that have undergone n-1 transitions, and the sum of their lengths is a first preset value. The lengths of the N coaxial cables are different from those of the n coaxial cables, and N = n.

[0059] One of the results of step S36 is: in response to the existence of a fourth combined cable, step S37 is executed.

[0060] The second result of step S36: In response to the absence of a fourth combination cable, proceed to step S38.

[0061] S37: Obtain the fourth combination cable. In response to the presence of the fourth combination cable, obtain the fourth combination cable and perform an electrostatic discharge test.

[0062] S38: Determine whether the electrostatic discharge test of all preset combination coaxial cables has been completed.

[0063] One of the judgment results of step S38: In response to the failure to complete the electrostatic test of all preset combination coaxial cables, step S39 is executed.

[0064] The second judgment result of step S38: In response to the completion of electrostatic testing of all preset combination coaxial cables, step S40 is executed.

[0065] S39: Obtain other preset coaxial cable combinations. Obtain other preset coaxial cable combinations for electrostatic discharge (ESD) testing. For example, obtain coaxial cable combinations with one more or less adapter number and unchanged cable length for ESD testing, or obtain coaxial cable combinations with one more or less adapter number and changed cable length for ESD testing.

[0066] S40: Perform high-frequency parameter testing on the cable. For example, perform high-frequency parameter testing on a pre-configured coaxial cable that meets the requirements for automotive electrostatic discharge testing to obtain the corresponding radio frequency parameters.

[0067] In some embodiments, the n coaxial cables in the preset combined coaxial cable are connected in a U-shape and / or an S-shape.

[0068] In the electrostatic discharge test using at least one pre-set coaxial cable combination, the n coaxial cables in the pre-set coaxial cable combination are connected in an S-shape. For example, when n=4, the pre-set coaxial cable combination consists of four coaxial cables that have undergone three adapters. Figure 4 As shown, Figure 4This is a schematic diagram of an electrostatic discharge (ESD) island test bench according to an embodiment of this application. The SerDes host is placed at the Device Under Test (DUT) position, the SerDes camera is placed at the auxiliary equipment position on the metal horizontal coupling plate, and the display screen is placed at the insulated bench position. The camera generates a high-speed SerDes signal, which is transmitted to the SerDes host through four segments of the coaxial SerDes adapter cable. The SerDes host decodes and transmits the video signal to the display screen for display. During testing, the coaxial SerDes cables are arranged in an S-shape / serpentine pattern. Furthermore, the first or more segments of the cable closest to the SerDes host should be placed on the discharge island, and the remaining segments should be placed on the horizontal coupling plate. The display screen cable should be kept as short as possible and meet ESD requirements to avoid display screen malfunctions affecting the test results. During the test, the ESD test results of the corresponding coaxial cable combination can be judged based on whether the display screen is normal. For example, if water ripples or screen flickering appear on the display screen, the ESD test results are judged not to meet the vehicle ESD test requirements.

[0069] When performing high-frequency parameter testing on at least one preset coaxial cable combination, the n coaxial cables in the at least one preset coaxial cable combination are connected in a U-shape. For example... Figure 5 As shown, Figure 5 This is a schematic diagram of a cable high-frequency parameter test bench according to an embodiment of this application. The preset combination coaxial cable to be tested is connected to two ports of the network analyzer to test the S-parameters, VSWR, and TDR parameters. The coaxial SerDes cable is placed in a U-shape to avoid multiple bends.

[0070] In some embodiments, such as Figure 6 As shown, Figure 6 This is a schematic diagram of the structure of the combined coaxial cable in this application embodiment. The combined coaxial cable 130 includes a serializer 131, a deserializer 132 and a transmission link 133. The transmission link 133 connects the serializer 131 and the deserializer 132 and is used to transmit target data.

[0071] The description of the various embodiments above tends to emphasize the differences between the various embodiments. The similarities or similarities between them can be referred to, and for the sake of brevity, they will not be repeated here.

[0072] In the several embodiments provided in this application, it should be understood that the disclosed methods and related devices can be implemented in other ways. For example, the related device implementations described above are merely illustrative. For instance, the division of modules or units is only a logical functional division, and in actual implementation, there may be other division methods. For example, units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication disconnection shown or discussed may be indirect coupling or communication disconnection through some interfaces, devices, or units, and may be electrical, mechanical, or other forms.

[0073] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0074] Those skilled in the art will readily recognize that numerous modifications and variations can be made to the apparatus and method while maintaining the teachings of this application. Therefore, the above disclosure should be considered limited only by the scope of the appended claims.

Claims

1. An in-vehicle device characterized by comprising: The application relates to a vehicle-mounted device, which comprises a collecting device for collecting target data, a host device for processing the target data, and a combined coaxial cable connected between the collecting device and the host device for transmitting the target data. The combined coaxial cable is determined based on a preset test rule and is obtained by m coaxial cables through m-1 times of switching, so that the vehicle-mounted device meets the vehicle-mounted electrostatic test requirement. The preset test rule comprises the following steps: obtaining at least one preset combined coaxial cable, each of which is obtained by n coaxial cables through n-1 times of switching, wherein the sum of the cable lengths of the n coaxial cables through n-1 times of switching is a preset value, the lengths of the n coaxial cables are the same, partly the same or different, and n is greater than or equal to 1; performing electrostatic test by using the at least one preset combined coaxial cable to obtain at least one test result; and selecting the combined coaxial cable from the at least one preset combined coaxial cable based on the at least one test result. The preset value comprises a first preset value and a second preset value, the second preset value is smaller than the first preset value, and the at least one preset combined coaxial cable at least comprises the following: a first combined coaxial cable obtained by n coaxial cables through n-1 times of switching and having a sum of cable lengths equal to the first preset value; a second combined coaxial cable obtained by n coaxial cables through n-1 times of switching and having a sum of cable lengths equal to the second preset value; and a third combined coaxial cable obtained by n-1 coaxial cables through n-2 times of switching and having a sum of cable lengths equal to the first preset value. The electrostatic test by using the at least one preset combined coaxial cable comprises the following steps: performing the electrostatic test on the first combined coaxial cable; judging whether the electrostatic test result of the first combined coaxial cable meets the vehicle-mounted electrostatic test requirement; and judging whether the first preset value is the minimum value of the sum of the cable lengths of the n coaxial cables in response to the electrostatic test result of the first combined coaxial cable not meeting the vehicle-mounted electrostatic test requirement. The electrostatic test by using the at least one preset combined coaxial cable further comprises the following steps: performing the electrostatic test on the second combined coaxial cable in response to the first preset value not being the minimum value of the sum of the cable lengths of the n coaxial cables; and performing the electrostatic test on the third combined coaxial cable in response to the first preset value being the minimum value of the sum of the cable lengths of the n coaxial cables. The electrostatic test by using the at least one preset combined coaxial cable further comprises the following steps: judging whether a fourth combined coaxial cable exists in response to the electrostatic test result of the first combined coaxial cable meeting the vehicle-mounted electrostatic test requirement; performing the electrostatic test on the fourth combined coaxial cable in response to the fourth combined coaxial cable existing; and judging whether the electrostatic test of the at least one preset combined coaxial cable is completed in response to the fourth combined coaxial cable not existing. ​ ​ ​ ​ ​ ​ 2. The in-vehicle device according to claim 1, characterized by, ​ ​ ​ ​ 3. The in-vehicle device according to claim 2, characterized by, ​ ​ ​ 4. The in-vehicle device according to claim 2, characterized by ​ ​ ​ ​ The fourth preset coaxial cable group is N coaxial cables after n-1 times of switching, the sum of cable lengths is the first preset value, the N coaxial cables are different from n coaxial cables in length, and N=n.

5. The in-vehicle device according to claim 4, characterized by The electrostatic test using the at least one preset coaxial cable group further includes: In response to the electrostatic test of the at least one preset coaxial cable group not being completed, performing the electrostatic test on the remaining preset coaxial cable groups in the at least one preset coaxial cable group; In response to the electrostatic test of the at least one preset coaxial cable group being completed, performing a cable high-frequency parameter test on the at least one preset coaxial cable group to obtain corresponding radio frequency parameters.

6. The in-vehicle device according to claim 5, characterized by The radio frequency parameters include at least one of scattering parameters, voltage standing wave ratio, and time domain reflectometer parameters.

7. The in-vehicle device according to claim 1, characterized by, The n coaxial cables in the at least one preset coaxial cable group are connected in a U shape and / or an S shape.

8. The in-vehicle device according to claim 1, characterized by, The coaxial cable group includes a serializer, a deserializer, and a transmission link for realizing transmission of the target data.

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